_______while writing, he locked himself in his study. [ ]

A. Not to interrupt      

B. Not being interrupted

C. Not to be interrupted    

D. Being not interrupted

下列对室性心动过速的诊断意义较大的是（）

A.通常突发突止，心室率常为100～250次／分

B.心律基本规则

C.有心室夺获与室性融合波

D.P波与QRS波群无固定关系，形成房室分离

E.宽大畸形QRS波群